Water Conditioning
Hydrothermal treatment requires wet spinning process water to soften bast fibres before mechanical draft draws them through pin drafters in Fujian spinning mills. Pectic substances bind flax bundles together until temperature adjustments dissolve binding gums inside the softening bath. Mill engineers measure pH levels within strict operating bands because alkaline drift weakens cellulose structures during continuous immersion runs.
Excessively hard supply introduces calcium ions that precipitate pectinates onto carding cylinders and fouls subsequent drawing frames.
Chemical Dosage
Acid addition neutralizes carbonate alkalinity inside wet spinning process water before sizing solutions enter the mixing vats for final yarn preparation. Sulfuric acid feeds automatically through diaphragm pumps responding to real time feedback from downstream conductivity probes. Residual mineral loads alter dyeing affinities across finished linen fabrics during subsequent piece dyeing operations at export finishing houses.
Operators track sulfate concentrations daily to prevent salt accumulation from corroding stainless steel troughs along the wet spinning lines.
Thermal Regulation
Heat exchangers maintain wet spinning process water at elevated temperatures to optimize pectin dissolution without boiling delicate bast fibres. Closed loop thermal circuits recover waste heat from boiler condensate returns to stabilize bath temperatures within narrow operational tolerances. Steam injection nozzles boost local enthalpy rapidly whenever cold supply surges from municipal reservoirs during winter months.
Unregulated thermal fluctuations cause uneven drafting tension across spinning positions and produce irregular yarn diameters in export shipments.
